steffens



w. L. STEFFENS.

PIPE COVERING SY STEM. APPLICATIQN FILED MAY 21. I919.

Reissued Oct. 26, 1920.

NVENTOR flu, ATT RNEY UNITED STATES;-

PATENT. OFFICE.

WALTER I. STEFIENS, OF CINCINNATI, OHIOfASSIGNOR TO THE PHILIP CAREY MANUFACTURING COMPANY, OF LOCKLAND, OHIO, A CORPORATION OF OHIO.

rirn-oovnnme' SYSTEM.

Original No. 1,227,087, dated Hay-2 2, 1917, Serial No.

filed May 21, 1919.

dent of lVyoming, (formerly of Hartwel ,1)

Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Pipe-Covering Systems, of which'the following is .a specitions and coverings therefor; and its object-gis to provide the pipe with simple and readily installed means to alford a maximum degree of covering or insulation.

My invention consists in the combination of parts and in the details of construction and arrangement of parts as will herein be more fully described and claimed.

In the drawing:

Figure 1 is a vertical longitudinal section of part of-a pipe-line installation embodying my invention, intermediate parts being omitted for lack of space;

Fig. 2 is a detail perspective view of a pipe and its mounting and coverings accord- ,ing to my invention, parts of the various elements being broken away to reveal the elements underlying; and

Fig. 3 is a vertical cross section on the line 33 of Fig. 1, enlarged.

My improved system includes a covering for the pipe 1 consisting of suitable insulat ing material 2 applied directly to the exterior of the pipe and entirely surrounding it, this material preferably being 85% basic magnesium carbonate, and preferably 15,11 in sections of convenient lengths. As struct my invention these sections are in three foot lengths.

The insulating covering 2 is in turn surrounded by a shell 3, surrounding which is a final outer shell 4. These shells provide a protective covering for the insulating material 2.

At suitable intervals, preferably every five lengths of the covering 2 or .every fifteen feet, roller supports 5 may be provided, with the insulating cover 2 abutting the support 5 closely at each end, and the shells 3 and 4 extending continuously over the material 2 and the roller supports 5.

As shown in the example herein, the entire structure from one manhole 6 to the next '(Fig. 1) is supported upon a drain Specification of Reissued Letters Patent. Reissued Oct, 26, 1920,

44,344, filed August 7, 1915. Application for reissue Serial No. 298,795.

age bed 7 which may be about six inches bed is laid along the bottom of a properly graded trench, which, when backfilled, iricloses the entire structure. The drainage bed may be suitably drained by tile drains to sewers or other points below the level of the trench.

Anchors 8 may be rigidly attached to the pipe at proper points and surrounded by solid blocks of concrete. In such case, the insulating cover 2 and its protective shells 3 and 4 are made to approach the anchor 8 closely at each side, and the unavoidable spaces therebetween are filled with insulating material 8' similar to that of the covering 2, preferably 85% magnesium cement. The concrete 8" is then .filled around the anchor and adjacent parts of the covering.

From the foregoing it will be observed.

that the only places where there need be interruptions in the insulating covering and its protective shells from the interior of one manhole 6'to the other, are where these anchors are to be provided, and here the insulating covering is made continuous around the anchor adjacent to the pipe and the entire structure is surrounded by the cement. This is one of the chief advantages of my invention in that there is no eifective conducting medium between the pipe itself and the; surrounding earth or other material in which it is buried, and the insulating benefits of the covering are realized to a very, high degree, without, however, sacrificing any of the necessary provisions for effectively supporting the pipe and providing for its variations in length under vary- The internal diameter of the shell of course depends upon. the size of the pipe upon which it is to'be used, and'the thickness okfl the shell will also de end somewhat upon t is. erably split on one side only, and is applied Each of the she ls 3 and 4 is prefslipping them over the exterior of the material 2 and roller supports 5, drawing the shell 3 tight by means of a rope or similar means passed therearound and drawn very tight, as by using it in the form of a tourniquet, and then while the shell is thus held with its edges abutting, suitable permanent fastening means are applied, such as staples 9 driven into the material of the shell across the split, completing a longitudinal seam 10,

- holding the shell tlghtly around the mateseams 10 in the same manner.

rial 2. Also, where the succeeding shells abut, staples 9 may complete transverse Then a coat of waterproof cement 3 may be applied to the outer surface of this first course of shells,

after which the shells 4 are applied in the,

manner such as above described and these are given a final coat of waterproof cementor other waterproofing material 4' this lastcoat being amply heavy. In moist or marshy ground it is desirable that this last outer coat be of coal tar pitch.

In applying these shells, both the longitudinal seams '10 and transverse seams 10" of the respective layers of shells 3 and 4 are broken in their relative arrangement, a. 6. so arranged that they will not coincide.

-Thus it will be seen that after the two courses of shells 3 and 4 are completed and finished with the waterproof cement or other material inside and out, they will form a practically continuous and impervious wat'erproof structure around the insulating material 2 and roller supports 5 from one manhole or pit 6 to the next. These shells extend through the walls of the pits 6 along with the pipe.

Each roller support 5 for the purpose of supporting the pipe 1 in such a manner as to leave it free to expand and contract and yet be inclosed by the protective shells 3 and 4, is preferably made upv of semi-cylindrical pieces 11 and 12, one of which comes below and the other above the pipe 1, with internal annular flanges 13 at their ends which bear around the pipe 1 and leave, in-

termediate of them, an annular air space 11 entirely aroundthe pipe 1, the two pieces 11 and 12 meeting snugly at opposite sides of the pipe and thus entirely surrounding it and entirely inclosing the airs ace 14, while presenting an exteriorlycylin rical formation of about the diameter of the insulating covering 2, and adapted to abut this material 2squarely at each end and be practically continuous therewith. Preferably this cylindrical roller support is of diameter slightly greater than that of the insulating material 2, so that it fits the protective shell 3 tightly and is thus sure to take the full support of the pipe 1 without leaving any of the weight of the pipe on the insulating material 2 between the succeeding roller supports.

The weight of the pipe 1 is transmitted to the lower piece 11 of the cylinder thus made up through the medium of a metal plate 15 and balls or rollers 16 between it and the pipe 1 (Fig. 1).

The casing or cylinder, made up of the .lower and upper pieces 11 and 12, may be made of asbestos in the form of a number of comparatively thin sheets laminated to the required thickness of the walls, and with strips of the same material laminated inside of these at the ends to form the flanges 13, the strips being adhesively secured together by a suitable adhesive adapted to withstand the heatof the pipe, where the pipe is used for conducting steam or other hot substance. Preferably both pieces 11 and 12 are covered and hinged together by a jacket 5 of textile material.

It is not necessary,- however, that the upper piece 12 be as shown, but it may be sufiicient to provide the lower piece 11 suitably made up in some-such manner as above described, and replace the piece 12 with a semicylindric-al pieceof the insulating cover 2 which, as before stated, is preferably of magneisum carbonate.

The shells 3 and 4, constructed of such material and applied asabove described, are tough and elastic, so that their joints are not disturbed nor their waterproof coating cracked or broken under any impacts, as, for instance, those incident to back-filling the trench. Furthermore, such heating and.

cooling as the protective shells 3 and '1 are subjected to by the pipe 1 does not result in any deterioration of the protective covering, because the shells,made up of suitable material, such as the impregnated or coated fibrous material, are sufficiently flexible to accommodate themselves to all of these For the larger sizes of pipe, preferably those of more than six inches nominal diameter, it is deslrable to provide, under the iso' I inbefore described.

concrete pieces to support the structure better than by the support" which is provided throughout the rest of the length of pipe and its covering from one manhole to the other, such as the dralnagebed, as here- Having fully described my invention, What I claim as new and desire to secure by Letters Patent is:

1. In an underground pipe-coverlng'system, in combination with a pipe, an insulating covering therefor and a separate and distinct protective structure around said insulatin covering, in the form of resillent cylindrlcal shells, each longitudinally separated on one side and sprung over said insulating covering and suitably secured together therearound.

2. In an underground pipe-covering system, in combination with the pipe, a friable insulating covering therefor, and a separate and distinct protective structure around said insulating covering, made up of layers of a fibrous material and a bitulithic substance intimately associated and brought into a resilient condition, in the form of longitudinally succeeding cylindrical shells, each longitudinally separated on one side and sprung over said insulating covering and suitably secured together therearound.

3. In an underground pipe-covering system, in combination with the-pipe, a friable insulating covering therefor, and a separate and distinct protective structure around said insulating covering, made up of layers of a fibrous material and impregnated 'and coated with a, bitulithic substance and brought into a resilient condition, in the form of longitudinally succeeding cylindrical shells, each longitudinally separated on one side and sprung over said insulating covering and suitably secured together there around.

'4. In an underground pipe-covering system, in combination with the pipe, and-an insulating covering therefor, a protective abutting.

5. In an underground pipe-covering system, in combination with the pipe, and an insulating covering therefor, a protective structure around said insulating cover, said protective covering being in the form of longitudinally succeeding cylindrical shells, each longitudinally separated on one side and sprung over said insulatin covering and seamed together therearoun along its separation, and with the ends of said shells abutting, said shells being coated with a waterproofing material.

6. In an underground pipe-covering system, in combination with the pipe, and an insulating covering therefor, a protective structure around said insulating cover, said protective covering being in the form of longitudinally succeeding cylindrical shells,

each longitudinally separated on one side and sprung over said insulating covering and seamed together therearound along .its separation, and with the ends of said shells abutting, and a succeeding course of cylindrical shells split and applied around the first mentioned shells as aforesaid, with waterproofing adhesive material between them.

7. In an underground pipe-covering system, in combination with the pipe, and an insulating covering therefor, a protective structure around said insulating cover, said protective covering being iritheform of longitudinally succeeding cylindrical shells, each longitudinally separated on one side and sprung over said insulating covering and seamed together therearound along its separatlon, and with the ends of said shells abuttlng, and a succeeding course of cylindrical shells split and applied around the first mentioned shells as aforesaid, with waterprooflng adhesive material between them, and this outer course being coated with a waterproofing material.

insulating covering therefor, 'a protective structure around said insulating cover, said protective covering being in the form. of longltudinally succeeding cylindrical shells, ea'ch longitudinally separated on one side and sprung over said insulatin covering and seamed to ther therearoun along its separation, an with the ends of said shells abutting, a succeeding course of cylindrical shells, split and applied around the first mentioned shells as aforesaid, with waterproofing adhesive material between them, and this outer course being coated with coal tar pitch.

9. In an underground pipe-covering'system, in combination with the pipe, and an insulating covering therefor, a protective structure around said insulating cover, said protective covering being in the form of longitudinally succeeding cylindrical shells, each longitudinally separated on one-side and sprung'over said insulatin covering and seamed together therearoun along its separation, and with the ends of said shells abutting, a succeeding course of cylindrical shells split and applied around the first mentioned shells as aforesaid, with Waterproof ing adhesive material between them, the

transverse abutting seams and the longitu-.

dinal seams of the inner shells being arrangedso-as not to coincide with the .re- .spective seams of the outer shells.

10. In an underground pipe-covering sys- 5 tem, in combination withthe pipe, and an insulating covering therefor, av protective structure around said insulating cover, an anchor rigidly secured to said protective covering abutting it at opposite sides, insulating material filling the spaces between the anchor and the' coverings, and concrete surrounding said anchor and said coverings. 11. In an underground pipe-covering systern. in combination with the pipe, and an insulating covering therefor, a protective structure around said insulating cover, an anchor rigidly secured to said pipe with said insulting covering and said protective covering abutting'it at opposite sides, insulating material filling the spaces between the anchor and the coverings, concrete surrounding said anchor and said coverings, and sup porting means for said pipe under said protective covering .at opposite sides of said anchor and the surrounding concrete.

12. A pipe covering comprising an insulating material adapted to entirely surround a pipe, a protective structure around said insulating material in the form of a substantially resilient shell.

. 13. In a pipe covering comprising an insulating material adapted to surround a pipe, a separate and distinct protective structure, around said insulating material,

in the form of a tough, elastic, substantially non-deteriorating shell.

14. In a pipe covering comprising a nonheat conducting material adapted to entirely surround a pipe, a separate and distinct protective structure around said material in the 40 cylindrical waterproof pipe, a separate and distinct protective structure, around said insulating covering, in the form of a resilient cylindrical Waterproof shell suitably secured therearound.

16. In a pipe covering comprising a non heat conducting material adapted to entirely surround a pipe, a separate and distinct protective structure around said material in the form of a resilient cylindrical waterproof shell longitudinally separated 'on one side and adapted to be sprung over-said material 65 and suitably secured together therearound.

17. A protective structure for pipe coverings comprising a resilient cylindrical-waterproof shell longitudinally separated on one side so as to be sprung over a covering, and means for suitably securing said shell together along the longitudinal separation after it is in place.

18. A pipe covering comprising an insulating material, adapted; to entirely surround a pipe, a plurality of independent cylindrical resilient waterproof shells surrounding said pipe covering, so arranged that said shells break joints with each other and said pipe covering. Each of said shells being longitudinallyopen on one side only and so arranged that said longitudinal openings of separate shells are not in alinemen't with next adjacent inner shell.

WALTER L. STEFFENS. 

